Lifting-jack.



J. WHALL.

LIFTING JACK.

APPLICATION FILED MAY 27, 1913.

Patented Jan. 5, 1915.

THE NORRIS PETERS CO.. PHOTO-LITHQ. WASHINGTON. D4 C.

UNIT

JAMES WHALL, OF CHRISTCHURCH, NEW ZEALAND.

LIFTING-J'ACK.

Specification of Letters Patent.

Patented J an. 5, 1915.

Application filed May 27, 1913. Serial No. 770,252.

To all whom it may concern: I

Be it known that I, JAMES WVHALL, blacksmith, subject of the King of Great Britain, residing at Christchurch, in the Dominion of New Zealand, have invented a new-and useful Improvement in Lifting-Jacks; and I do hereby declare the following to be a full, clear, and exact description of the same.

This invention relates to an improved construction of lifting jack serviceable for raising vehicles or for other uses and with which are combined means whereby the jack may be employed for stump lifting and other analogous operations wherein a chain has to be drawn upward.

According to this invention the jack is formed by a standard of suitable strength that may be provided with a shorter length linked to the lower end in such a manner that such length may be made to extend longitudinally with the main len th, to extend laterally across beneath its bottom end or to be turned from beneath such end. In this manner the height of the standard may be varied to any one of the three lengths. Upon the top end of the standard the lifting lever is pivoted. In this invention such lever consists of a metal bar bent so as to extend across above the top of the standard and then down on both sides thereof. The pivot bolt then passes through these side pieces and the standard and the height of the top piece above the standard may be adjusted by having pivot points at different heights in the standard. One of the side members in the lever is continued downward to form a handle by raising which the top member of the lever may be lowered to fit beneath the article to be lifted and by lowering which the lever may be lifted to extend longitudinally above the standard and. thus raise the article upon it. A stop which forms no part of the invention and is therefore not shown is provided on the standard with which the handle will enga e when it has been turned slightly beyond the lowest level of its movement so that the article will thereby be retained in the raised position in the well known way. A forked claw is pivotally hung upon a bar extending across between the side members of the lever near the top thereof and this claw is shaped so as to fit between and engage the links of the chain. Upon the reverse side of the standard a somewhat similar claw is fixed but reversed in position. A chain hung across the top of the standard willthus onthe one side extend down beneath the pivoted claw, and'on the other side pass; down over the fixed claw. When therefore the lever is worked down and up by the up and down movement'of the handle the pivoted claw may be caused to slide down over the chain, obtain a grip thereon and then draw up with upward movement of the claw. The fixed claw will allow the slack caused in the chain to pass down over it and will then grip and hold the chain. When the lifting claw moves down to obtain a fresh hold, thus by manipulating the lever the chain may be drawn up and the jack employed for raising stumps or other articles to which the chain is fixed.

In the accompanying drawings :Figure l is a side elevation of the jack. Fig. 2 is a back end elevation thereof. Fig. 3 is a front end elevation of the upper portion of the ac c.

A is the standard which may be provided at its lower end with the shorter length A connected to it by means of the link a in such a manner that the height of the standard may be varied to any one of the different heights shown by the full and dotted lines in Fig. 1.

C is the lifting lever made in the known way of a single length of metal bar bent so as to extend across the top of the standard and then down on both sides thereof being pivoted to the standard A so as to turn up and down thereon.

In this invention a cross bar D extends between the two sides of the lifting lever above the standard top. Upon this bar is hung the forked claw E having the inwardly curving jaws F. These jaws are adapted to pass one on each side of the links of the lifting chain G passed over the top of the standard and with the upward movement of the lever to engage with the chain and raise it and with the downward movement of the lever to release the chain and allow of a fresh grip upon the chain so that on the next upward movement a further lifting of the chain is effected. Thus by working the lifting lever up and down the chain may be drawn in.

Upon the reverse side of the standard is fixed the claw H which is made similar in shape to the lifting claw R and formed with jaws J arranged upmost. The inner end of the chain G hangs down past this claw so that its links pass between and ena standard, a lifting lever' of substantially gage "beneath its jaws on each movement of the chain. It will therefore hold the chain between each grip and release ofthe liftingcoplelof this patent may :lae obtained for travel over said standard and intermediate the arms of said lifting lever, a chain retaining element rigidly secured to one side of said standard, a chain actuating element pivoted to said lifting lever adjacent the pposite side of said standard, substantially as described.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

J AME WH L- Witnesses:

E, HUGH s, ALFRED R, HoLDsmP.

five cents each. by addressing the Commissioner of Patents,

Washington, D. C." 

